It all really depends on what you want to create - so the best I can do is tell you my experience.
I use Unreal for XR, generative art and some architectural previz. After following some of the basic tuts by epic, I got a bundle of GameDev.tv courses from Humble Bundle. They were game-centric, but tought me a lot about the flow in Unreal (it is very different from 2D, 3D, Motion or UX that I had experience with in the past).
One tip I can offer is this - before you build something, google it. Very often I ended up learning the tool / blueprint / function / command already existed for something I was about to spend days making from scratch. (Other times, the engine lacks some very basic things one would think surely are there…)
Best of luck! UE is an amazing tool to learn.
GameDev.tv seems to always claim their classes are super pricey, but have a deep discount somewhere 
90% Black Friday at the moment.